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158 lines
5.3 KiB
158 lines
5.3 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* Private data and functions for adjunct processor VFIO matrix driver. |
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* |
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* Author(s): Tony Krowiak <[email protected]> |
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* Halil Pasic <[email protected]> |
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* Pierre Morel <[email protected]> |
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* |
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* Copyright IBM Corp. 2018 |
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*/ |
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#ifndef _VFIO_AP_PRIVATE_H_ |
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#define _VFIO_AP_PRIVATE_H_ |
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#include <linux/types.h> |
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#include <linux/device.h> |
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#include <linux/mdev.h> |
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#include <linux/delay.h> |
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#include <linux/mutex.h> |
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#include <linux/kvm_host.h> |
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#include <linux/vfio.h> |
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#include <linux/hashtable.h> |
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#include "ap_bus.h" |
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#define VFIO_AP_MODULE_NAME "vfio_ap" |
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#define VFIO_AP_DRV_NAME "vfio_ap" |
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/** |
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* struct ap_matrix_dev - Contains the data for the matrix device. |
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* |
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* @device: generic device structure associated with the AP matrix device |
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* @available_instances: number of mediated matrix devices that can be created |
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* @info: the struct containing the output from the PQAP(QCI) instruction |
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* @mdev_list: the list of mediated matrix devices created |
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* @mdevs_lock: mutex for locking the AP matrix device. This lock will be |
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* taken every time we fiddle with state managed by the vfio_ap |
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* driver, be it using @mdev_list or writing the state of a |
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* single ap_matrix_mdev device. It's quite coarse but we don't |
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* expect much contention. |
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* @vfio_ap_drv: the vfio_ap device driver |
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* @guests_lock: mutex for controlling access to a guest that is using AP |
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* devices passed through by the vfio_ap device driver. This lock |
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* will be taken when the AP devices are plugged into or unplugged |
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* from a guest, and when an ap_matrix_mdev device is added to or |
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* removed from @mdev_list or the list is iterated. |
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*/ |
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struct ap_matrix_dev { |
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struct device device; |
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atomic_t available_instances; |
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struct ap_config_info info; |
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struct list_head mdev_list; |
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struct mutex mdevs_lock; /* serializes access to each ap_matrix_mdev */ |
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struct ap_driver *vfio_ap_drv; |
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struct mutex guests_lock; /* serializes access to each KVM guest */ |
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}; |
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extern struct ap_matrix_dev *matrix_dev; |
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/** |
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* struct ap_matrix - matrix of adapters, domains and control domains |
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* |
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* @apm_max: max adapter number in @apm |
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* @apm: identifies the AP adapters in the matrix |
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* @aqm_max: max domain number in @aqm |
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* @aqm: identifies the AP queues (domains) in the matrix |
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* @adm_max: max domain number in @adm |
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* @adm: identifies the AP control domains in the matrix |
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* |
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* The AP matrix is comprised of three bit masks identifying the adapters, |
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* queues (domains) and control domains that belong to an AP matrix. The bits in |
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* each mask, from left to right, correspond to IDs 0 to 255. When a bit is set |
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* the corresponding ID belongs to the matrix. |
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*/ |
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struct ap_matrix { |
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unsigned long apm_max; |
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DECLARE_BITMAP(apm, 256); |
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unsigned long aqm_max; |
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DECLARE_BITMAP(aqm, 256); |
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unsigned long adm_max; |
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DECLARE_BITMAP(adm, 256); |
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}; |
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/** |
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* struct ap_queue_table - a table of queue objects. |
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* |
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* @queues: a hashtable of queues (struct vfio_ap_queue). |
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*/ |
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struct ap_queue_table { |
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DECLARE_HASHTABLE(queues, 8); |
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}; |
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/** |
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* struct ap_matrix_mdev - Contains the data associated with a matrix mediated |
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* device. |
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* @vdev: the vfio device |
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* @node: allows the ap_matrix_mdev struct to be added to a list |
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* @matrix: the adapters, usage domains and control domains assigned to the |
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* mediated matrix device. |
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* @shadow_apcb: the shadow copy of the APCB field of the KVM guest's CRYCB |
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* @kvm: the struct holding guest's state |
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* @pqap_hook: the function pointer to the interception handler for the |
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* PQAP(AQIC) instruction. |
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* @mdev: the mediated device |
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* @qtable: table of queues (struct vfio_ap_queue) assigned to the mdev |
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* @apm_add: bitmap of APIDs added to the host's AP configuration |
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* @aqm_add: bitmap of APQIs added to the host's AP configuration |
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* @adm_add: bitmap of control domain numbers added to the host's AP |
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* configuration |
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*/ |
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struct ap_matrix_mdev { |
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struct vfio_device vdev; |
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struct list_head node; |
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struct ap_matrix matrix; |
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struct ap_matrix shadow_apcb; |
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struct kvm *kvm; |
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crypto_hook pqap_hook; |
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struct mdev_device *mdev; |
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struct ap_queue_table qtable; |
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DECLARE_BITMAP(apm_add, AP_DEVICES); |
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DECLARE_BITMAP(aqm_add, AP_DOMAINS); |
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DECLARE_BITMAP(adm_add, AP_DOMAINS); |
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}; |
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/** |
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* struct vfio_ap_queue - contains the data associated with a queue bound to the |
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* vfio_ap device driver |
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* @matrix_mdev: the matrix mediated device |
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* @saved_iova: the notification indicator byte (nib) address |
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* @apqn: the APQN of the AP queue device |
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* @saved_isc: the guest ISC registered with the GIB interface |
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* @mdev_qnode: allows the vfio_ap_queue struct to be added to a hashtable |
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* @reset_rc: the status response code from the last reset of the queue |
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*/ |
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struct vfio_ap_queue { |
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struct ap_matrix_mdev *matrix_mdev; |
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dma_addr_t saved_iova; |
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int apqn; |
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#define VFIO_AP_ISC_INVALID 0xff |
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unsigned char saved_isc; |
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struct hlist_node mdev_qnode; |
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unsigned int reset_rc; |
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}; |
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int vfio_ap_mdev_register(void); |
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void vfio_ap_mdev_unregister(void); |
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int vfio_ap_mdev_probe_queue(struct ap_device *queue); |
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void vfio_ap_mdev_remove_queue(struct ap_device *queue); |
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int vfio_ap_mdev_resource_in_use(unsigned long *apm, unsigned long *aqm); |
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void vfio_ap_on_cfg_changed(struct ap_config_info *new_config_info, |
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struct ap_config_info *old_config_info); |
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void vfio_ap_on_scan_complete(struct ap_config_info *new_config_info, |
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struct ap_config_info *old_config_info); |
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#endif /* _VFIO_AP_PRIVATE_H_ */
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